/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/GameplayEffectTypes.h
Pretty weird that the assignment operator copies the handle when the copy constructor doesn't - bug?
[FGameplayTagBlueprintPropertyMapping](API\Plugins\GameplayAbilities\FGameplayTagBlueprintPropertyMap-) & operator= ( const [FGameplayTagBlueprintPropertyMapping](API\Plugins\GameplayAbilities\FGameplayTagBlueprintPropertyMap-) & Other )